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.TH FCLOSEALL 3  2021-03-22 "GNU" "Linux Programmer's Manual"
.SH NAME
fcloseall \- close all open streams
.SH SYNOPSIS
.nf
.BR "#define _GNU_SOURCE" "         /* See feature_test_macros(7) */"
.B #include <stdio.h>
.PP
.B int fcloseall(void);
.fi
.SH DESCRIPTION
The
.BR fcloseall ()
function closes all of the calling process's open streams.
Buffered output for each stream is written before it is closed
(as for
.BR fflush (3));
buffered input is discarded.
.PP
The standard streams,
.IR stdin ,
.IR stdout ,
and
.I stderr
are also closed.
.SH RETURN VALUE
This function returns 0 if all files were successfully closed;
on error,
.B EOF
is returned.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.ad l
.nh
.TS
allbox;
lbx lb lb
l l l.
Interface	Attribute	Value
T{
.BR fcloseall ()
T}	Thread safety	MT-Unsafe race:streams
.TE
.hy
.ad
.sp 1
.PP
The
.BR fcloseall ()
function does not lock the streams, so it is not thread-safe.
.SH CONFORMING TO
This function is a GNU extension.
.SH SEE ALSO
.BR close (2),
.BR fclose (3),
.BR fflush (3),
.BR fopen (3),
.BR setbuf (3)
.SH COLOPHON
This page is part of release 5.13 of the Linux
.I man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
\%https://www.kernel.org/doc/man\-pages/.
